Tool for inserting and removing stud bolts



Oct. 16, 1951 R. A. VALVANO TOOL FOR INSERTING AND REMOVING STUD BOLTS Filed June 3, 1946 FIG. 2.

FIG.

FIG. 4.

'Illl w "I II "I ll IIIIHI lh FIG.5.

, INVENTOR. RALPH A. VALVANO I ATTORNEYS Patented Oct. 16, 1951 UNITED STAT OFFICE TOOL FOR INSERTING AND REMOVING STUD BOLTS 1 Claim. 1

This invention relates generally to tools for manipulating threaded members such as bolts and the like, and particularly relates to tools known as stud drivers or stud pullers designed for inserting or removing stud bolts.

Various types of stud drivers have been used,

moving studs from the members into which they have been threaded at some prior time, but such means so far as I am aware tend to seriously mar the threads on the stud unless the same is veryloosely mounted, with the result that in many cases it is impossible to use the stud again.

It is a primary object of this invention to provide a novel tool which is a combination stud driver and stud puller, that is, it may be used both for inserting and for removing stud bolts.

It is a particular object to provide a combination tool of the type indicated which is of simple construction and may be quickly and easily adjusted for use as a stud puller or driver.

It is also an object of this invention to provide a simple tool of the type indicated which can be used without damaging the threads on the stud, thereby enabling the re-use of studs removed from members in which they may have been tightly mounted.

It is a further object to provide a tool of this type which may be used as a die element for cleaning and renewing damaged threads.

These and other objects will be apparent from the accompanying drawing and the following description. Referring to the drawing, which is for illustrative purposes only:

Fig. 1 is a sectional elevation of the tool shown with relation to a stud secured in a member;

Fig. 2 is an elevation of the tool as viewed from the right-hand side of the same, as it is shown in Fig. 1;

Fig. 3 is a cross sectional view on line 33 of Fig. 1;

Fig. 4 is a view similar to Fig. 2, showing the wedge inserted from the opposite side from which it is shown in the previously described figures; and

Fig. 5 is a perspective view of the wedge and bar member of the invention.

More particularly describing the invention, reference numeral l0 generally indicates a body member which, in the form shown, is in the shape of an elongated hexagonal nut; that is, the member is provided with the faces II on its outer surface arranged to form a hexagon and afiording a gripping surface for a wrench or other tool and is provided with a central bore l2 extending therethrough. The member of course might be made square or of other crosssectional shape. The bore [2 is provided with screw threads !3 which correspond to the threads Id on a stud bolt l5 to be driven or pulled. For the purpose of illustration, the stud bolt l5 has been shown mounted in a member I6.

Although the bore 12 has been shown extending entirely through the body member Hi, this is not essential and it is also unnecessary that the screw threads 13 extend all the way through, it only being necessary that the bore and the threads provided therein extend for a suiiicient distance to permit of the entry of the threaded end M of the stud bolt 15 to a point where the threads on the bolt may be engaged by a locking means generally indicated by numeral l8 and which will now be described.

As indicated above, means generally indicated by numeral I8 are provided for locking the body member H! and a stud bolt received therein against relative rotation when desired in order that rotation of the element I 9 will efiect a similar and corresponding rotation of the stud bolt. In the form of the invention shown, this means embodies generally a wedge member adapted to fit within a recess or opening in the body member 10 for locking the parts. Specifically, the body member If) is provided with an opening or slot 2!] extending therethrough at right angles to the axis of the bore I2 and spaced radially of said axis, being located in the region of the periphery of the bore. As illustrated, and preferably, this opening 28 extends both inwardly and outwardly of the periphery of the bore at a point radially spaced on a line at right angles to the longitudinal axis of the opening.

A look member, generally indicated by numeral 22, having a wedge-shaped portion 23 and an extension thereon in the form of a slotted bar 24, is mounted on the body member I 0 by means of a pivotscrew 25 extending through the slot 26 in the bar and being threaded into the body member outwardly of the opening 29. The inner surface of the wedge portion 23 is inclined with respect to the outer surface and is provided with a plurality of thread-like grooves 28. The grooves are made to correspond to the threads within the body member l0, differing therefrom in being straight. In addition, the grooves 28 may be provided with roughened faces 29 similar to the faces of a file in order to insure a firm grip on the stud bolt as the lock member is wedged be tween the body member and the stud bolt. The wedge portion 23 fits loosely in the opening 28 to allow the wedge ,portion to adjust itself to the threadsof the bolt.

In operation the body member I is screwed onto the stud bolt, as indicated in Fig. 1. The locking member is then manipulated in order to insert the wedge portion 23 into the opening 29, as indicated in Fig. 3. Depending upon whether it is desired to pull or drive the stud bolt, that is, whether it is desired to rotate the stud bolt to remove it from a hole or thread it into a hole, the wedge portion 23 will be inserted from one side or the other of the opening 20. As indicated in Fig. 3, the wedge is inserted in a position to-pull or rotate the bolt in a counterclockwise position, it being evident that rotation of the body member ID counterclockwise will serve to firmly wedge the wedge portion 23 between the outer boundary of the opening 20 and the threads on the stud bolt, the roughened surfaces of the grooved or serrated surface of the wedge serving to firmly engage the individual threads on the stud bolt at the periphery of the bolt so that the body member H3 and the bolt l5 ma be turned as the unit.

It is obvious that if it is desired to rotate the bolt in an opposite direction, it is only necessary to remove the wedge from the side of an open" ing 26 on which it is shown, pivot the wedge and its attached bar around, swinging the wedge below the "lower end of the body member 19 and insert the wedge from the opposite end of the ho1e'20.

In forming the opening 28 through the body racies in the thread of the stud as the body member 10 is removed from the stud, the body member acting as a die.

Although the invention has been particularly shown and described in a preferred form, it is contemplated that various changes and modifications can be made without departing from the scope of the invention and it @is not, therefore, desired to limit the invention except as defined in the appended claim.

I claim:

A tool for inserting and removing stud bolts and thelike comprising a body member having a threaded bore therein for receiving a stud bolt and having an opening intersecting said bore and extending substantially at right angles to the axis thereof in the region of the periphery of said base, a locking member for preventing relative rotation of said body member and a stud bolt therein, said locking member including a .wedge portion adapted to fitinto said opening in said body member to engagea stud bolt therein and a .bar portion extending parallel to the wedge in spaced relation thereto, said bar being provided with an elongated slot, and a radially extending pin secured in said body member outwardly of said opening .therethrough, said pin extending through the slot in said bar portion and having a bar retaining head thereon, said bar portion of the locking member and the slot therein being substantially longer than said wedge portion whereby to permit the removal of said wedge portion from said opening and to permit the'wedge portion, upon removal, to swing clear of said body member upon pivotal movement of said "locking member on said pin.

RALPH A. VALVANO.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 661,901 Alaman Nov. 13, 1900 691,406 Morgan Jan. 21, "1902 1,516,602 Hill Nov. 25, 1924 1,594,081 Van Duzer July 27, 1926 1,813,424 Roche July 7, 1931 2,014,319 Flinn Sept. 10,1935 

